[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / rcutree_trace.c

/*
 * Read-Copy Update tracing for classic implementation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright IBM Corporation, 2008
 *
 * Papers:  http://www.rdrop.com/users/paulmck/RCU
 *
 * For detailed explanation of Read-Copy Update mechanism see -
 * 		Documentation/RCU
 *
 */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/smp.h>
#include <linux/rcupdate.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <asm/atomic.h>
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/completion.h>
#include <linux/moduleparam.h>
#include <linux/percpu.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/mutex.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>

#include "rcutree.h"

static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
{
	if (!rdp->beenonline)
		return;
	seq_printf(m, "%3d%cc=%ld g=%ld pq=%d pqc=%ld qp=%d",
		   rdp->cpu,
		   cpu_is_offline(rdp->cpu) ? '!' : ' ',
		   rdp->completed, rdp->gpnum,
		   rdp->passed_quiesc, rdp->passed_quiesc_completed,
		   rdp->qs_pending);
#ifdef CONFIG_NO_HZ
	seq_printf(m, " dt=%d/%d dn=%d df=%lu",
		   rdp->dynticks->dynticks,
		   rdp->dynticks->dynticks_nesting,
		   rdp->dynticks->dynticks_nmi,
		   rdp->dynticks_fqs);
#endif /* #ifdef CONFIG_NO_HZ */
	seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi);
	seq_printf(m, " ql=%ld b=%ld\n", rdp->qlen, rdp->blimit);
}

#define PRINT_RCU_DATA(name, func, m) \
	do { \
		int _p_r_d_i; \
		\
		for_each_possible_cpu(_p_r_d_i) \
			func(m, &per_cpu(name, _p_r_d_i)); \
	} while (0)

static int show_rcudata(struct seq_file *m, void *unused)
{
	seq_puts(m, "rcu:\n");
	PRINT_RCU_DATA(rcu_data, print_one_rcu_data, m);
	seq_puts(m, "rcu_bh:\n");
	PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
	return 0;
}

static int rcudata_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcudata, NULL);
}

static struct file_operations rcudata_fops = {
	.owner = THIS_MODULE,
	.open = rcudata_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
{
	if (!rdp->beenonline)
		return;
	seq_printf(m, "%d,%s,%ld,%ld,%d,%ld,%d",
		   rdp->cpu,
		   cpu_is_offline(rdp->cpu) ? "\"Y\"" : "\"N\"",
		   rdp->completed, rdp->gpnum,
		   rdp->passed_quiesc, rdp->passed_quiesc_completed,
		   rdp->qs_pending);
#ifdef CONFIG_NO_HZ
	seq_printf(m, ",%d,%d,%d,%lu",
		   rdp->dynticks->dynticks,
		   rdp->dynticks->dynticks_nesting,
		   rdp->dynticks->dynticks_nmi,
		   rdp->dynticks_fqs);
#endif /* #ifdef CONFIG_NO_HZ */
	seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
	seq_printf(m, ",%ld,%ld\n", rdp->qlen, rdp->blimit);
}

static int show_rcudata_csv(struct seq_file *m, void *unused)
{
	seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\",");
#ifdef CONFIG_NO_HZ
	seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\",");
#endif /* #ifdef CONFIG_NO_HZ */
	seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\"\n");
	seq_puts(m, "\"rcu:\"\n");
	PRINT_RCU_DATA(rcu_data, print_one_rcu_data_csv, m);
	seq_puts(m, "\"rcu_bh:\"\n");
	PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
	return 0;
}

static int rcudata_csv_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcudata_csv, NULL);
}

static struct file_operations rcudata_csv_fops = {
	.owner = THIS_MODULE,
	.open = rcudata_csv_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
{
	int level = 0;
	struct rcu_node *rnp;

	seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x "
	              "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",
		   rsp->completed, rsp->gpnum, rsp->signaled,
		   (long)(rsp->jiffies_force_qs - jiffies),
		   (int)(jiffies & 0xffff),
		   rsp->n_force_qs, rsp->n_force_qs_ngp,
		   rsp->n_force_qs - rsp->n_force_qs_ngp,
		   rsp->n_force_qs_lh);
	for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) {
		if (rnp->level != level) {
			seq_puts(m, "\n");
			level = rnp->level;
		}
		seq_printf(m, "%lx/%lx %d:%d ^%d    ",
			   rnp->qsmask, rnp->qsmaskinit,
			   rnp->grplo, rnp->grphi, rnp->grpnum);
	}
	seq_puts(m, "\n");
}

static int show_rcuhier(struct seq_file *m, void *unused)
{
	seq_puts(m, "rcu:\n");
	print_one_rcu_state(m, &rcu_state);
	seq_puts(m, "rcu_bh:\n");
	print_one_rcu_state(m, &rcu_bh_state);
	return 0;
}

static int rcuhier_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcuhier, NULL);
}

static struct file_operations rcuhier_fops = {
	.owner = THIS_MODULE,
	.open = rcuhier_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int show_rcugp(struct seq_file *m, void *unused)
{
	seq_printf(m, "rcu: completed=%ld  gpnum=%ld\n",
		   rcu_state.completed, rcu_state.gpnum);
	seq_printf(m, "rcu_bh: completed=%ld  gpnum=%ld\n",
		   rcu_bh_state.completed, rcu_bh_state.gpnum);
	return 0;
}

static int rcugp_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcugp, NULL);
}

static struct file_operations rcugp_fops = {
	.owner = THIS_MODULE,
	.open = rcugp_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static struct dentry *rcudir, *datadir, *datadir_csv, *hierdir, *gpdir;
static int __init rcuclassic_trace_init(void)
{
	rcudir = debugfs_create_dir("rcu", NULL);
	if (!rcudir)
		goto out;

	datadir = debugfs_create_file("rcudata", 0444, rcudir,
						NULL, &rcudata_fops);
	if (!datadir)
		goto free_out;

	datadir_csv = debugfs_create_file("rcudata.csv", 0444, rcudir,
						NULL, &rcudata_csv_fops);
	if (!datadir_csv)
		goto free_out;

	gpdir = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
	if (!gpdir)
		goto free_out;

	hierdir = debugfs_create_file("rcuhier", 0444, rcudir,
						NULL, &rcuhier_fops);
	if (!hierdir)
		goto free_out;
	return 0;
free_out:
	if (datadir)
		debugfs_remove(datadir);
	if (datadir_csv)
		debugfs_remove(datadir_csv);
	if (gpdir)
		debugfs_remove(gpdir);
	debugfs_remove(rcudir);
out:
	return 1;
}

static void __exit rcuclassic_trace_cleanup(void)
{
	debugfs_remove(datadir);
	debugfs_remove(datadir_csv);
	debugfs_remove(gpdir);
	debugfs_remove(hierdir);
	debugfs_remove(rcudir);
}


module_init(rcuclassic_trace_init);
module_exit(rcuclassic_trace_cleanup);

MODULE_AUTHOR("Paul E. McKenney");
MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
MODULE_LICENSE("GPL");
Commit	Line	Data
64db4cff PM	1	/*
	2	* Read-Copy Update tracing for classic implementation
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	17	*
	18	* Copyright IBM Corporation, 2008
	19	*
	20	* Papers: http://www.rdrop.com/users/paulmck/RCU
	21	*
	22	* For detailed explanation of Read-Copy Update mechanism see -
	23	* Documentation/RCU
	24	*
	25	*/
	26	#include <linux/types.h>
	27	#include <linux/kernel.h>
	28	#include <linux/init.h>
	29	#include <linux/spinlock.h>
	30	#include <linux/smp.h>
	31	#include <linux/rcupdate.h>
	32	#include <linux/interrupt.h>
	33	#include <linux/sched.h>
	34	#include <asm/atomic.h>
	35	#include <linux/bitops.h>
	36	#include <linux/module.h>
	37	#include <linux/completion.h>
	38	#include <linux/moduleparam.h>
	39	#include <linux/percpu.h>
	40	#include <linux/notifier.h>
	41	#include <linux/cpu.h>
	42	#include <linux/mutex.h>
	43	#include <linux/debugfs.h>
	44	#include <linux/seq_file.h>
	45
6258c4fb IM	46	#include "rcutree.h"
6258c4fb IM	47
64db4cff PM	48	static void print_one_rcu_data(struct seq_file m, struct rcu_data rdp)
	49	{
	50	if (!rdp->beenonline)
	51	return;
ef631b0c	52	seq_printf(m, "%3d%cc=%ld g=%ld pq=%d pqc=%ld qp=%d",
64db4cff PM	53	rdp->cpu,
	54	cpu_is_offline(rdp->cpu) ? '!' : ' ',
	55	rdp->completed, rdp->gpnum,
	56	rdp->passed_quiesc, rdp->passed_quiesc_completed,
ef631b0c	57	rdp->qs_pending);
64db4cff PM	58	#ifdef CONFIG_NO_HZ
	59	seq_printf(m, " dt=%d/%d dn=%d df=%lu",
	60	rdp->dynticks->dynticks,
	61	rdp->dynticks->dynticks_nesting,
	62	rdp->dynticks->dynticks_nmi,
	63	rdp->dynticks_fqs);
	64	#endif /* #ifdef CONFIG_NO_HZ */
	65	seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi);
	66	seq_printf(m, " ql=%ld b=%ld\n", rdp->qlen, rdp->blimit);
	67	}
	68
	69	#define PRINT_RCU_DATA(name, func, m) \
	70	do { \
	71	int _p_r_d_i; \
	72	\
	73	for_each_possible_cpu(_p_r_d_i) \
	74	func(m, &per_cpu(name, _p_r_d_i)); \
	75	} while (0)
	76
	77	static int show_rcudata(struct seq_file m, void unused)
	78	{
	79	seq_puts(m, "rcu:\n");
	80	PRINT_RCU_DATA(rcu_data, print_one_rcu_data, m);
	81	seq_puts(m, "rcu_bh:\n");
	82	PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
	83	return 0;
	84	}
	85
	86	static int rcudata_open(struct inode inode, struct file file)
	87	{
	88	return single_open(file, show_rcudata, NULL);
	89	}
	90
	91	static struct file_operations rcudata_fops = {
	92	.owner = THIS_MODULE,
	93	.open = rcudata_open,
	94	.read = seq_read,
	95	.llseek = seq_lseek,
	96	.release = single_release,
	97	};
	98
	99	static void print_one_rcu_data_csv(struct seq_file m, struct rcu_data rdp)
	100	{
	101	if (!rdp->beenonline)
	102	return;
ef631b0c	103	seq_printf(m, "%d,%s,%ld,%ld,%d,%ld,%d",
64db4cff PM	104	rdp->cpu,
	105	cpu_is_offline(rdp->cpu) ? "\"Y\"" : "\"N\"",
	106	rdp->completed, rdp->gpnum,
	107	rdp->passed_quiesc, rdp->passed_quiesc_completed,
ef631b0c	108	rdp->qs_pending);
64db4cff PM	109	#ifdef CONFIG_NO_HZ
	110	seq_printf(m, ",%d,%d,%d,%lu",
	111	rdp->dynticks->dynticks,
	112	rdp->dynticks->dynticks_nesting,
	113	rdp->dynticks->dynticks_nmi,
	114	rdp->dynticks_fqs);
	115	#endif /* #ifdef CONFIG_NO_HZ */
	116	seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
	117	seq_printf(m, ",%ld,%ld\n", rdp->qlen, rdp->blimit);
	118	}
	119
	120	static int show_rcudata_csv(struct seq_file m, void unused)
	121	{
ef631b0c	122	seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\",");
64db4cff PM	123	#ifdef CONFIG_NO_HZ
	124	seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\",");
	125	#endif /* #ifdef CONFIG_NO_HZ */
	126	seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\"\n");
	127	seq_puts(m, "\"rcu:\"\n");
	128	PRINT_RCU_DATA(rcu_data, print_one_rcu_data_csv, m);
	129	seq_puts(m, "\"rcu_bh:\"\n");
	130	PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
	131	return 0;
	132	}
	133
	134	static int rcudata_csv_open(struct inode inode, struct file file)
	135	{
	136	return single_open(file, show_rcudata_csv, NULL);
	137	}
	138
	139	static struct file_operations rcudata_csv_fops = {
	140	.owner = THIS_MODULE,
	141	.open = rcudata_csv_open,
	142	.read = seq_read,
	143	.llseek = seq_lseek,
	144	.release = single_release,
	145	};
	146
	147	static void print_one_rcu_state(struct seq_file m, struct rcu_state rsp)
	148	{
	149	int level = 0;
	150	struct rcu_node *rnp;
	151
	152	seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x "
	153	"nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",
	154	rsp->completed, rsp->gpnum, rsp->signaled,
	155	(long)(rsp->jiffies_force_qs - jiffies),
	156	(int)(jiffies & 0xffff),
	157	rsp->n_force_qs, rsp->n_force_qs_ngp,
	158	rsp->n_force_qs - rsp->n_force_qs_ngp,
	159	rsp->n_force_qs_lh);
	160	for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) {
	161	if (rnp->level != level) {
	162	seq_puts(m, "\n");
	163	level = rnp->level;
	164	}
	165	seq_printf(m, "%lx/%lx %d:%d ^%d ",
	166	rnp->qsmask, rnp->qsmaskinit,
	167	rnp->grplo, rnp->grphi, rnp->grpnum);
	168	}
	169	seq_puts(m, "\n");
	170	}
	171
	172	static int show_rcuhier(struct seq_file m, void unused)
	173	{
	174	seq_puts(m, "rcu:\n");
	175	print_one_rcu_state(m, &rcu_state);
	176	seq_puts(m, "rcu_bh:\n");
	177	print_one_rcu_state(m, &rcu_bh_state);
	178	return 0;
	179	}
	180
	181	static int rcuhier_open(struct inode inode, struct file file)
	182	{
	183	return single_open(file, show_rcuhier, NULL);
	184	}
	185
	186	static struct file_operations rcuhier_fops = {
187	.owner = THIS_MODULE,
188	.open = rcuhier_open,
189	.read = seq_read,
190	.llseek = seq_lseek,
191	.release = single_release,
192	};
193
194	static int show_rcugp(struct seq_file m, void unused)
195	{
196	seq_printf(m, "rcu: completed=%ld gpnum=%ld\n",
197	rcu_state.completed, rcu_state.gpnum);
198	seq_printf(m, "rcu_bh: completed=%ld gpnum=%ld\n",
199	rcu_bh_state.completed, rcu_bh_state.gpnum);
200	return 0;
201	}
202
203	static int rcugp_open(struct inode inode, struct file file)
204	{
205	return single_open(file, show_rcugp, NULL);
206	}
207
208	static struct file_operations rcugp_fops = {
209	.owner = THIS_MODULE,
210	.open = rcugp_open,
211	.read = seq_read,
212	.llseek = seq_lseek,
213	.release = single_release,
214	};
215
216	static struct dentry rcudir, datadir, datadir_csv, hierdir, *gpdir;
217	static int __init rcuclassic_trace_init(void)
218	{
219	rcudir = debugfs_create_dir("rcu", NULL);
220	if (!rcudir)
221	goto out;
222
223	datadir = debugfs_create_file("rcudata", 0444, rcudir,
224	NULL, &rcudata_fops);
225	if (!datadir)
226	goto free_out;
227
228	datadir_csv = debugfs_create_file("rcudata.csv", 0444, rcudir,
229	NULL, &rcudata_csv_fops);
230	if (!datadir_csv)
231	goto free_out;
232
233	gpdir = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
234	if (!gpdir)
235	goto free_out;
236
237	hierdir = debugfs_create_file("rcuhier", 0444, rcudir,
238	NULL, &rcuhier_fops);
239	if (!hierdir)
240	goto free_out;
241	return 0;
242	free_out:
243	if (datadir)
244	debugfs_remove(datadir);
245	if (datadir_csv)
246	debugfs_remove(datadir_csv);
247	if (gpdir)
248	debugfs_remove(gpdir);
249	debugfs_remove(rcudir);
250	out:
251	return 1;
252	}
253
254	static void __exit rcuclassic_trace_cleanup(void)
255	{
256	debugfs_remove(datadir);
257	debugfs_remove(datadir_csv);
258	debugfs_remove(gpdir);
259	debugfs_remove(hierdir);
260	debugfs_remove(rcudir);
261	}
262
263
264	module_init(rcuclassic_trace_init);
265	module_exit(rcuclassic_trace_cleanup);
266
267	MODULE_AUTHOR("Paul E. McKenney");
268	MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
269	MODULE_LICENSE("GPL");